John Daly walks on the eleventh green during a practice round for the 96th PGA Championship at the Valhalla Golf Club in Louisville. Erik S. Lesser EPA

Memorabilia from the 2008 Ryder Cup is on display in the club house at the PGA Championship golf tournament at Valhalla Golf Club. Jeff Roberson AP

Sergio Garcia reacts during a practice round prior to the start of the 96th PGA Championship. Andy Lyons Getty Images

Henrik Stenson crosses a bridge during a practice round at Valhalla Golf Club in Louisville. Andrew Redington Getty Images

A volunteer marks long drive competition yardages on the tenth tee during a practice round for the PGA Championship. Jeff Gross Getty Images

U.S. Open winner Martin Kaymer is seen though the players walkway on the 17th hole during a practice round for the PGA Championship golf tournament at Valhalla Golf Club. David J. Phillip AP

A man sits in a chair along the ninth fairway during a practice round for the 96th PGA Championship golf tournament at the Valhalla Golf Club in Louisville. Larry W. Smith EPA

Phil Mickelson hits his tee shot on the 18th hole during a practice round for the PGA Championship golf tournament at Valhalla Golf Club. David J. Phillip AP

Keegan Bradley watches Phil Mickelson play on the 17th hole during a practice round for the PGA Championship golf tournament at Valhalla Golf Club. David J. Phillip AP

Rory McIlroy speaks during a press conference held during practice for the 2014 PGA Championship at Valhalla Country Club. Brian Spurlock USA TODAY Sports

Rory McIlroy of Northern Ireland poses for photo in the Omega Exhibition during a practice round prior to the start of the 96th PGA Championship at Valhalla Golf Club in Louisville. Andrew Redington Getty Images

Justin Rose gets a putting lesson on the 17th hole during a practice round for the PGA Championshi. David J. Phillip AP

Rory McIlroy during a press conference for the PGA Championship at the Valhalla Golf Club in Louisville. Erik S. Lesser EPA

Billy Horschel hits a tee shot as patrons look on during a practice round prior to the start of the PGA Championship at Valhalla Golf Club in Louisville. Mike Ehrmann Getty Images

Zach Johnson stands alongside his bag during a practice round prior to the start of the 96th PGA Championship. Mike Ehrmann Getty Images

The flag on the 18th hole is seen during a practice round prior to the start of the 96th PGA Championship at Valhalla Golf Club. Mike Ehrmann Getty Images

A view of the 13th green during a practice round prior to the start of the 96th PGA Championship at Valhalla Golf Clubin Louisville. Scott Halleran Getty Images

Adam Scott of Australia walks across a bridge to the tee during a practice round prior to the start of the 96th PGA Championship at Valhalla Golf Club Louisville. Jeff Gross Getty Images

Adam Scott of Australia tees off during a practice round prior to the start of the 96th PGA Championship at Valhalla Golf Club. Jeff Gross Getty Images

Crowds gather to watch during a practice round prior to the start of the 96th PGA Championship at Valhalla Golf Club. Jeff Gross Getty Images

Chris Wood of England signs autographs for fans during a practice round prior to the start of the 96th PGA Championship. Mike Ehrmann Getty Images

ags are seen near the practice ground during a practice round prior to the start of the 96th PGA Championship at Valhalla Golf Club in Louisville. Andy Lyons Getty Images

Scott Brown looks on after hitting a tee shot during a practice round prior to the start of the 96th PGA Championship at Valhalla Golf Club. Warren Little Getty Images

A view of the 18th hole. Scott Halleran Getty Images

A tee sign is seen on the 18th hole during a practice round prior to the start of the 96th PGA Championship at Valhalla Golf Club in Louisville. Scott Halleran Getty Images

Jordan Spieth signs autographs for fans during a practice round prior to the start of the 96th PGA Championship at Valhalla Golf Club in Louisville. Mike Ehrmann Getty Images

Chris Wood of England walks across a bridge with his caddie during a practice round prior to the start of the PGA Championship Warren Little Getty Images

Tiger Woods' caddie, Joe LaCava, stands on the 18th green after walking the course at the PGA Championship. It is unclear whether Woods, who re-injured his back Sunday, will be able to play in the final major of the year. Jeff Roberson AP

Rickie Fowler puts on his glove during a practice round prior to the start of the PGA Championship. Warren Little Getty Images